KR19990059284A - Tone Monitoring and Emulation System at Digital Trunk Connections - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital trunk connection, and in particular, a digital trunk connection for directly performing inspection and emulation of various tones occurring when the digital trunk network is connected at the digital trunk network connection. Relates to tone monitoring and emulation systems.

In the conventional method, the audible line can be audible only when the trunk line is connected. However, according to the present invention, various tones generated when a T1 or E1 digital trunk network is connected at the digital trunk network connection are analyzed by the DSP. By storing PCM data in DRAM and applying it to the CPU through address and data buffers, the CPU transmits the test tone data through the SRAM to the other GSTN by tone transmission logic, which is an electrical characteristic of the connected digital trunk line. Identify the cause when an error occurs due to noise, gain, frequency distortion, frequency deviation, etc., and identify and emulate the cause of the error caused by subtle differences in protocol in hardware or software matters such as timing when heterogeneous connections are made. You can solve it through

Description

Tone monitoring and emulation system at digital trunk connections

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital trunk connection, and in particular, a digital trunk connection for directly performing inspection and emulation of various tones occurring when the digital trunk network is connected at the digital trunk network connection. Relates to tone monitoring and emulation systems.

In the conventional digital trunk connection unit, there are two methods for solving a problem occurring when the digital trunk (eg, T1, E1) network is connected.

For example, as shown in FIG. 1, the monitoring device 11, which is an external measurement device, is connected to the first and second systems 12-1 and 12-2 by a digital trunk line of T1 and E1. On-line monitors such as T1, E1 line characteristic monitors, R2-MFC signal format monitors, dual tone multi frequency (DTMF) tone monitors, gain and frequency measurements, etc. Depending on the function of the equipment should be used separately.

Meanwhile, as another example, as illustrated in FIG. 2, a switching chip 13 and a plurality of T1 and E1 framers 14-14 are installed and operated in a conventional T1 and E1 network connection circuit. 1 to 14-N), a plurality of line drivers (15-1 to 15-N), a DA converter 16, and a speaker 17, and a plurality of corresponding T1 and E1 framers. A plurality of line drivers 15-1 to 15-N are inputted to the corresponding switching chip 13 through 14-1 to 14-N or through corresponding T1 and E1 framers 14-1 to 14-N. Each component is connected to 32 channels of receive highway (RxHW) and transmit highway (TxHW).

The switching chip 13 selects one channel among the plurality of reception highways (RxHW) and transmission highways (TxHW) and applies it to the corresponding DA converter 16 through the transmission channel (TxCH), and the corresponding DA converter ( 16 converts Pulse Code Modulaton (PCM) data applied from the corresponding switching chip 13 into an analog signal, and applies the converted analog signal to the corresponding speaker 17. The speaker 17 corresponds to the corresponding DA converter ( By transmitting the analog waveform converted from 16) to the outside, voice and various tones transmitted on the T1 and E1 digital trunks can be audible.

In the configuration of FIG. 2 as described above, operations for audible, DTMF tones, FAX tones, R2-MFC signals, and various tones of the digital trunk network connection are performed in a 24-channel T1 digital trunk in a general switched telephone network (GSTN). The signal input through the 32 channel E1 digital trunk is applied to the plurality of T1 and E1 framers 14-1 to 14-N via the corresponding line drivers 15-1 to 15-N.

The plurality of T1 and E1 framers 14-1 to 14-N transmit corresponding input signals to a plurality of receive highways (RxHW1 to RxHWN) of input 32 channels in the corresponding GSTN (Transister Transister Logic) or CMOS (Complementary). Metal Oxide Semiconductor) is converted into a signal of the level and applied to the switching chip 13, the signal of the receiving highway (RxHW) input to the switching chip 13 is connected to the highway (HW) in the system.

In addition, the output from the system to the GSTN is connected to the highway (HW) in the system to the corresponding switching chip 13, the switching chip 13 is connected to a plurality of transmission highway (HW) in the input system (HW) TxHW1 to TxHWN) to the plurality of framers 14-1 to 14-N.

Accordingly, the plurality of framers 14-1 to 14 -N generate a signal input from the corresponding switching chip 13 in a frame structure of T1 or E1, thereby providing the corresponding line drivers 15-1 to 15 -N. It is sent to GSTN via.

At this time, the corresponding switching chip 13 selects one channel among a plurality of incoming receive highways (RxHW) and transmit highways (TxHW) and applies it to the corresponding DA converter 16 through the corresponding transmit channel (TxCH). That is, any one of 32 channels of the first receiving highway RxHW1 and the first transmitting highway TxHW1 is selected and applied to the corresponding DA converter 16.

Then, the DA converter 16 converts the transmission channel TxCH applied from the switching chip 13 into an analog waveform and then makes it audible from the outside through the speaker 17.

As described above, it is possible to make an approximate estimate of which tone or voice is currently transmitted on the T1 or E1 trunk without equipment connected from the outside.

However, additional service equipment connected to the corresponding GSTN, for example, VMS (Voice Mail System), ARS (Auto Response System), FMS (Fax Mail System), voice recognition system, etc. are DTMF tone, FAX tone, R2-MFC tone Although recognition and transmission are very important, there are many difficulties in connection due to the difference in protocol between the connection line and the GSTN exchanger.

In other words, the existing method is audible only for the connection line at the time of connection, causing errors due to the noise, gain, frequency distortion, frequency deviation, etc., which are the electrical characteristics of the connection line. There was a problem that the cause of the error occurrence due to the subtle differences in the protocol in the hardware or software matters such as timing at the time of identification and heterogeneous connection was very difficult.

In order to solve the problems as described above, the present invention is to check and emulate various tones such as R2-MFC, DTMF, FAX sound generated when T1 or E1 digital trunk network connection at the digital trunk network connection, the connected digital Identifying causes when errors occur due to the electrical characteristics of the trunk line, such as noise, gain, frequency distortion, and frequency deviations, and errors due to subtle differences in protocols in hardware or software matters such as timing when heterogeneous connections are made. The purpose of this study is to identify the cause of the occurrence and to solve it.

1 is a block diagram illustrating an example of a tone monitoring and emulation system in a conventional digital trunk connection.

Figure 2 is a block diagram showing another example of the tone monitoring and emulation system in a conventional digital trunk connection.

3 is a block diagram illustrating a tone monitoring and emulation system in a digital trunk connection according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

21: switching chip 22: framer

23: line driver 24: DA converter

25: speaker 31: DSP

32: ROM 33: DRAM

34: address buffer 35: data buffer

36: CPU 37: SRAM

38: tone transmission logic

The present invention provides a tone monitoring and emulation system in a digital trunk connection including a switching chip, a plurality of T1 and E1 framers, a plurality of line drivers, a DA converter, and a speaker. A DSP for analyzing various transmit and receive tones between the system and the GSTN inputted through a single receive channel from the switching chip; A ROM for storing a DSP related program of the DSP; A DRAM for storing a predetermined amount for reanalysis of the PCM data analyzed by the DSP; An address buffer for switching the address analyzed by the DSP; A data buffer for switching the PCM data analyzed by the DSP; A CPU for determining information about various transmission / reception tones between the system and a GSTN from PCM data applied through the address buffer and the data buffer, analyzing an error, and downloading tone data for testing the GSTN; An SRAM for storing tone data downloaded under the control of the CPU; And tone transmission logic for reading tone data stored in the SRAM, converting the read tone data into serial data, and transmitting the tone data to the switching chip through one transmission channel.

The present invention can identify the cause through monitoring the problems that may occur when heterogeneous network access through the T1 or E1 digital trunk and emulate the problem at the network connection to propose a corresponding solution to the cause of the occurrence, attached below It will be described as follows with reference to the drawings.

In the digital trunk connection according to the embodiment of the present invention, the tone monitoring and emulation system includes a switching chip 21, a plurality of T1 and E1 framers 22-1 to 22-N, as shown in FIG. Line drivers 23-1 to 23-N, DA converter 24, speaker 25, DSP (Digital Signal Processor) 31, ROM 32, DRAM 33, address A buffer 34, a data buffer 35, a CPU 36, an SRAM 37, and a tone sender logic 38 are included.

The plurality of T1 and E1 framers 22-1 to 22-N, the plurality of line drivers 23-1 to 23-N, the DA converter 24, and the speaker 25 are the same as in the conventional configuration. Therefore, the description is omitted.

The switching chip 21 selects one channel among a plurality of incoming receive highways RxHW1 to RxHWN and transmit highways TxHW1 to TxHWN, and the DSP 31 or the DA converter through the selected receive channel RxCH. And a channel input from the tone transmission logic 38 to the plurality of T1 and E1 framers 22-1 to 22-N and a plurality of line drivers 23-1 to 23-N. To the GSTN's exchange.

The DSP 31 analyzes various tones, such as DTMF tones, FAX tones, and R2-MFC tones, which are input through one channel, stores the analysis contents in the DRAM 33, and stores the address buffer 34 and data. The CPU 36 informs the CPU 36 through the buffer 35, and stores a predetermined amount of PCM data of 8 (Kbyte) per second input through one channel in the DRAM 33.

The ROM 32 stores a DSP related program of the DSP 31.

The DRAM 33 stores PCM data applied from the DSP 31 and outputs the PCM data to the CPU 36 when necessary.

The address buffer 34 switches the address of the analyzed content applied from the DSP 31 to the CPU 36.

The data buffer 35 switches the analyzed content applied from the DSP 31 to the CPU 36.

The CPU 36 receives contents analyzed through the address buffer 34 and the data buffer 35 and an address, determines information on various tones input from the GSTN, and analyzes the tones input by an error. Downloading tone data to be transmitted to the SRAM 37 for testing the other terminal or exchange of the GSTN.

The SRAM 37 stores various tones such as DTMF tones, FAX tones, and R2-MFC tones to be transmitted through one transmission channel (TxCH) applied under the control of the CPU 36.

The tone transmission logic 38 reads the tone data stored in the SRAM 37, converts the read tone data into serial data, and transmits the tone data to the switching chip 21 through the transmission channel (TxCH). give.

In the digital trunk connection according to the embodiment of the present invention, there are three operations of the tone monitoring and emulation system, that is, monitoring operations on T1 and E1 trunk inputs, monitoring operations on outputs to T1 and E1 trunks, and Classified as emulation operation for tone, it can be explained as follows.

First, the monitoring operation for the T1 and E1 trunk inputs, the signal input through the T1 digital trunk line (TL) of 24 channels or the E1 digital trunk line (TL) of 32 channels in the GSTN is a plurality of line drivers It is applied to a plurality of T1 and E1 framers 22-1 to 22-N via 23-1 to 23-N.

Accordingly, the plurality of T1 and E1 framers 22-1 to 22-N convert the signals input through the plurality of line drivers 23-1 to 23-N into signals of TTL or CMOS level, and convert the corresponding signals. When the signal is applied to the switching chip 21 through the plurality of reception highways RxHW1 to RxHWN, the switching chip 21 selects one channel among the plurality of reception highways RxHW1 to RxHWN and selects the corresponding reception. The channel RxCH is input to the DSP 31.

Accordingly, the DSP 31, DTMF tone, FAX tone, R2-MFC contained in one reception channel (RxCH) input from the switching chip 21 according to the DSP related program stored in the ROM 32 Analyzes various tones such as tones and applies the analyzed to the address buffer 34 and the data buffer 35 to analyze the types of the analyzed tones and the noise, gain, frequency distortion, and frequency deviation, which are electrical characteristics of the tones. The address buffer 34 switches the address of the analyzed content applied from the DSP 31 to the CPU 36, and the data buffer 35 corresponds to the analyzed content applied from the DSP 31. The CPU 36 is switched.

Then, the CPU 36 receives the contents and the address analyzed through the address buffer 34 and the data buffer 35 to determine information on various tones input from the GSTN to easily determine the tones input by an error. Analyze

Second, referring to the monitoring operation for the output to the trunk T1, E1, as the monitoring of the channel transmitted from the system to the GSTN, the highway (HW) inside the system is connected to the switching chip 21 The highway (HW) inside the system is transmitted to the plurality of framers 22-1 to 22-N through a plurality of transmission highways TxHW1 to TxHWN, and the plurality of framers 22-1 to 22-N. Generates a signal input from the switching chip 21 into a frame structure of T1 or E1 and is transmitted to the GSTN via the plurality of line drivers 23-1 to 23-N.

However, the switching chip 21 selects one channel among a plurality of transmission highways TxHW1 to TxHWN transmitted to the GSTN and transmits the selected one channel to the DSP 31 through the reception channel RxCH. Enter it.

Accordingly, the DSP 31 analyzes various tones, such as DTMF tones, FAX tones, and R2-MFC tones, which are carried from the switching chip 21 through the reception channel RxCH, and the types of the analyzed tones and the corresponding tones. Analysis of noise, gain, frequency distortion, frequency deviation, and the like, which are electrical characteristics of a tone, is applied to the address buffer 34 and the data buffer 35 to switch to the CPU 36 in the same operation as described above. Switch.

Accordingly, when the CPU 36 receives various contents and addresses analyzed through the address buffer 34 and the data buffer 35 and transmits various tones to the GSTN, whether or not an error occurs in the system itself. Can make cause analysis easier.

In addition, the DSP 31 stores the PCM data applied through the receiving channel RxCH from the switching chip 21 in the DRAM 33 and, if necessary, reads the PCM data stored in the DRAM 33. Can be analyzed again.

For example, various tones such as DTMF tones, FAX tones, and R2-MFC tones on the reception channel (RxCH) are applied as PCM data having a capacity of 8 (Kbyte) per second, and the corresponding PCM data is about 3 For 1 minute, i.e., 1,44 (Mbyte) of 8 (Kbyte) * 3 (minute) * 60 (second), the DRAM 33 is recorded, and the recorded data is read back from the CPU 36. Reanalysis is possible.

Thirdly, when looking at the emulation operation for each tone, the emulation function of the corresponding tone recognizes various tones such as DTMF tones, FAX tones, and R2-MFC tones transmitted from the corresponding system at the other exchange or terminal belonging to the GSTN. If it does not, it measures the performance and function of the other party by transmitting various different types of tones.

First, when downloading tone data to be transmitted to the SRAM 37 for testing by the CPU 36, the SRAM 37 stores the tone data downloaded from the CPU 36.

Accordingly, the tone transmission logic 38 reads the tone data stored in the SRAM 37 in hardware, converts the read tone data into serial data, and transmits the converted tone data through the transmission channel TxCH. Send it to

Accordingly, the switching chip 13 receives tone data from the tone transmission logic 38 through the transmission channel TxCH and selects one channel among the plurality of transmission highways TxHW, and the selected one. T1 and E1 framers (22-1 to 22-N) and line drivers (23-1 to 23-) connected to the selected one transmit highway (TxHW) through the transmit highway (TxHW) N) to transmit to the other side exchange or terminal of the GSTN.

For example, if the system transmits a tone with a frequency of 900 (Hz) and a gain of -20 (db) but is not recognized correctly by the other exchange or terminal, i.e., the other exchange or terminal has a frequency of 920 ( Hz) and a gain of -18 (db), the frequency and gain are changed so that the transmission and storage in the SRAM 37 are repeatedly performed until the other exchange or terminal recognizes the tone. You can find the recognition range.

That is, various tones such as DTMF tones, FAX tones, and R2-MFC tones can be emulated by the above-described operation, and the DA converter 24 can separate the receiving channel RxCH from the switching chip 21. After converting the signal applied to the analog waveform through the speaker 25 makes it audible from the outside.

Thus, by installing the present invention in the T1 or E1 digital trunk network connection of the system, when connecting to other types of exchanges or the corresponding system occurs during the transmission and reception of the R2-MFC signaling method using various tones and tones of DTMF tones, FAX tones Various problems in system interworking related to the tone can be easily found and the solution can be suggested through the cause identification and emulation.

As described above, according to the present invention, various tones generated at the time of T1 or E1 digital trunk network connection in the digital trunk network connection are analyzed in the DSP, and the analyzed PCM data is stored in the DRAM and applied to the CPU through the address and the data buffer. When the test tone data is transmitted from the CPU to the other GSTN by the tone transmission logic via the SRAM, an error occurs due to noise, gain, frequency distortion, frequency deviation, etc., which are electrical characteristics of the connected digital trunk line. In this case, the cause of the error and the emulation can be solved for the occurrence of the error due to the nuance of the protocol in hardware or software matters such as timing at the time of connection between heterogeneous types.

Claims (1)

Switching chip 21, a plurality of T1 and E1 framers 22-1 to 22-N, a plurality of line drivers 23-1 to 23-N, a DA converter 24, and a speaker 25 In the tone monitoring and emulation system at a digital trunk connection having a, A DSP (31) for analyzing various transmission and reception tones between a system and a GSTN inputted from the switching chip (21) via one reception channel (RxCH); A ROM (32) for storing a DSP related program of said DSP (31); A DRAM (33) for storing a predetermined amount for reanalysis of the PCM data analyzed by the DSP (31); An address buffer 34 for switching an address analyzed by the DSP 31; A data buffer 35 for switching the PCM data analyzed by the DSP 31; By analyzing the information about the various transmission and reception tones between the system and the GSTN from the PCM data applied through the address buffer 34 and the data buffer 35 to analyze the presence or absence of errors, and downloading the tone data for testing the GSTN A CPU 36; An SRAM 37 for storing tone data to be downloaded under the control of the CPU 36; The tone transmission logic 38 reads the tone data stored in the SRAM 37, converts the read tone data into serial data, and transmits the tone data to the switching chip 21 through one transmission channel (TxCH). Tone monitoring and emulation system at the digital trunk connection, characterized in that made.